A fully coupled 2D fluid-solid direct numerical simulation (DNS) approach is used to simulate co-flow flame spread over poly(methyl methacrylate) (PMMA) at different angles of inclination. Comparison of simulations and experimental measurements are conducted over a range of flame spread rates. Results show that the heat flux to the preheating region varies considerably in time -contradicting often employed assumptions used in established flame spread theories. Accounting for the time dependent behavior is ess…
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